Two screws at the top of the radio. Loosen them then push them down and the head unit will slider out. It's a T20 I believe. Slide the head unit out and unplug the large black plug. It's a lever style plug so just pull the lever over and it pops out. No force needed to get it lose. Locate the fiber optic plug and unplug it from the large black plug you just took out of the head unit. You're gonna put it into the harness they supply you.